I'm running MS 7, IE11 and Google Chrome. Yesterday, while using Google Chrome incognito, I experienced a pop-up window that seemed like it might be scareware. It described some "suspicious activity at page 11449847918.rsc.cdn77.org trying to modify my OS" and instructions to call: "Microsoft Certified Technician at 888-992-0126" and for me to not touch "any of my internet windows or tabs; like explorer, google, etc. and to not shut down or reboot my pc". I did not call the number; instead I x'd out of IE tabs and window, but I could not x out of the "scareware" window - it just kept popping back up and I could not x out of Google Chrome. I hit "alt-ctl-del" and forced Chrome to close. I restarted the pc and ran a scan with Webroot; and it reported no detections of unusual files.
What is this "suspicious activity window" and how do I use Webroot to make sure the "suspicious activity pop-up" left nothing behind on my pc nor that it changed any of my OS settings?